Single crystals of 6LiI(Eu) are known to be efficient scintillators for detection of thermal neutrons on the background of gamma-radiation.

Density: 4.06 g/cm³
Refraction index: 1.96
Luminescence maximum: 470 nm
Light output: 11,000 photons/MeV
Resolution of thermal neutron peak: 4 - 7%
Scintillation decay time: 1.4 μs
Gamma-equivalent: 3 - 5 MeV

Distribution spectra of pulse amplitudes from detectors based on LiI(Eu) of dimensions Ø12,5x8 mm and NaI(Tl) under excitation by gamma-radiation of ¹³⁷Cs and thermal neutrons from Pu-Be